diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2012-01-04 23:29:18 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-12 11:29:43 -0800 |
| commit | 5b511b783385bc68663e4729be7f169ce3061e6d (patch) | |
| tree | ef3e9794fa8cdaf393725860ffa29e6eafd2f056 | |
| parent | 4781ace0ddff8057f2c1bf1811ae4886f8b88876 (diff) | |
xhci: Properly handle COMP_2ND_BW_ERR
commit 71d85724bdd947a3b42a88d08af79f290a1a767b upstream.
I encountered a result of COMP_2ND_BW_ERR while improving how the pwc
webcam driver handles not having the full usb1 bandwidth available to
itself.
I created the following test setup, a NEC xhci controller with a
single TT USB 2 hub plugged into it, with a usb keyboard and a pwc webcam
plugged into the usb2 hub. This caused the following to show up in dmesg
when trying to stream from the pwc camera at its highest alt setting:
xhci_hcd 0000:01:00.0: ERROR: unexpected command completion code 0x23.
usb 6-2.1: Not enough bandwidth for altsetting 9
And usb_set_interface returned -EINVAL, which caused my pwc code to not
do the right thing as it expected -ENOSPC.
This patch makes the xhci driver properly handle COMP_2ND_BW_ERR and makes
usb_set_interface return -ENOSPC as expected.
This should be backported to stable kernels as old as 2.6.32.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/host/xhci.c | 1 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.h | 1 |
2 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index a1afb7c39f7e..36f9dd81c49e 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1620,6 +1620,7 @@ static int xhci_configure_endpoint_result(struct xhci_hcd *xhci, /* FIXME: can we allocate more resources for the HC? */ break; case COMP_BW_ERR: + case COMP_2ND_BW_ERR: dev_warn(&udev->dev, "Not enough bandwidth " "for new device state.\n"); ret = -ENOSPC; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 3c8fbd2772ea..09eda3a8e51c 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1033,7 +1033,6 @@ struct xhci_transfer_event { /* Invalid Stream ID Error */ #define COMP_STRID_ERR 34 /* Secondary Bandwidth Error - may be returned by a Configure Endpoint cmd */ -/* FIXME - check for this */ #define COMP_2ND_BW_ERR 35 /* Split Transaction Error */ #define COMP_SPLIT_ERR 36 |